Fix image rendering and add vector glyph support

[Kyle-Ye]

Summary

• Fix symbol variant not working by using candidateName instead of name in vectorInfo lookup
• Fix resolveVector to correctly set isTemplate: true, handle background shape/size, and add redaction support
• Fix adjustForBackground to use CUIVectorGlyphGraphicVariantOptions properly and move #if OPENSWIFTUI_LINK_COREUI guards inside methods
• Add basic renderVectorGlyph implementation (single-layer foreground style, TODO for full RBSymbolUpdate multi-layer rendering)
• Optimize CoreUI conditional compilation checks
• Add SunsetScene example, variable image example, and new UI test cases
• Remove rotation animation from SunsetScene example

Test plan

• Run swift test --filter OpenSwiftUICompatibilityTests to verify snapshot tests
• Run swift build to confirm compilation
• Verify SunsetScene example renders correctly on device
• Verify symbol variant test (symbolVarient) passes
• Verify variable value image test passes

[augmentcode]

🤖 Augment PR Summary

Summary: This PR improves SF Symbol/vector-glyph image rendering and adds initial vector-glyph support.

Changes:

• Fixes symbol-variant resolution by using candidateName for vector glyph lookup (so .symbolVariant(...) selects the correct asset).
• Updates resolveVector to mark vector glyphs as template images, handle symbol-background sizing/metrics, and support symbol redaction.
• Reworks background adjustment to use CUIVectorGlyphGraphicVariantOptions and moves #if OPENSWIFTUI_LINK_COREUI checks into the relevant methods.
• Adds a basic renderVectorGlyph implementation for a single foreground layer (multi-layer/palette rendering remains TODO).
• Adds a new Sunset scene demo and a variable-value symbol demo.
• Adds new UI snapshot tests for symbol variants and variable-value symbol images; keeps rendering-mode tests disabled for now.
• Extends OpenCombine integration by adding OpenCombineFoundation and updates the DarwinPrivateFrameworks pin.

Technical Notes: Multi-layer symbol rendering is intentionally deferred; current implementation focuses on correct lookup, sizing/metrics, and single-layer template rendering.

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

_openSwiftUIUnimplementedWarning() prints on every call and (in DEBUG && OPENSWIFTUI_DEVELOPMENT) escalates to _openSwiftUIUnimplementedFailure, so invoking it in renderVectorGlyph can become very noisy or crash in dev builds when rendering SF Symbols.

Severity: medium

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.93%. Comparing base (6c991c1) to head (b19f67a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...tUICore/Shape/ShapeStyle/ShapeStyleRendering.swift	0.00%	13 Missing ⚠️
...ources/OpenSwiftUICore/View/Image/NamedImage.swift	0.00%	2 Missing ⚠️
...ces/OpenSwiftUICore/View/Image/ResolvedImage.swift	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (6c991c1) and HEAD (b19f67a). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (6c991c1)	HEAD (b19f67a)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #816       +/-   ##
===========================================
- Coverage   27.48%   13.93%   -13.55%     
===========================================
  Files         661      626       -35     
  Lines       42429    37921     -4508     
===========================================
- Hits        11661     5286     -6375     
- Misses      30768    32635     +1867     

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